I played it before and now I played it again. It's ok, it's 3 roentgen (not great, not terrible) but it's another nodebuster clone, where instead of defending the center you defend the bottom of the screen. Same grindy tree, same short levels, same formula, just different theme.

If you're into nodebuster clones, or nodebuster inspired games (or however you want to call them), give it a try.